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A trap street was a fake street inserted onto a map by a cartographer for the purposes of preventing or identifying copyright infringement. As Clara Oswald described it, a trap street was "a cartographer uses a fake street, throws it into the mix [of street names], [and] names it after one of his kids or whatever. Then if the fake street, "the trap street," ever shows up on someone else's map, they know their work's been stolen."